Sawing apparatus



.Hume 17 1924.

J. T. AUDEN sAwING APPARATUS Filed Aug. 25 1922 INVENTOR.

@AM Mw- ATTORNEY.

Patented .lune 17, 1924..

srss

ATENT GFFICE."

racen fr. UDEN, or. NEW Yoan, N. Y.

SA'WING AEEARATUS.

.eppncnonniea August 25, 192e. serial no. 524,232.

of New York, have invented certain new and useful improvements in `lmwing Ap paratus, of which the following is a specification. i f

My invention relates to sawing apparatus 'and has a particular reference to apparatus employing a movable straight saw blade in a stationary frame.

The object of my invention is to provide a portable sawing apparatus adapted to be attached to the work, such as a log, standing tree etc., and further adapted to be operated by a single person.

My invention is more fully rescribed in the accompanying specification and drawing in Which- Fig. 1 is an elevation offmy apparatus, Fig. 2 is a rear view, Fig. 3 is a partial plan view, and Fig. 4 is a sectional vien7 of a portion of my apparatus. v

My sawing apparatus consists of a frame 1 formed of two flat pieces 1 and 1, ioined together by means of bolts or rivets 2 and spacers 3. The ends of the frame are provided with guiding plates 4 for sliding blocks 5 to which the ends of a saw blade 6 are attached. The other ends of the blocks 5 have holes 7 for the ends of a chain or steel cable 8 (or any other suitable flexible carrier). This cable is stretched around the iframe 1 on rollers 9 and is attached to a rotating sleeve 10 on a crank 11. The ends of this crank are rotatively mounted in the frame, and a pinion 12 is attached to one end of this crank. This pinion meshes with a gear 13 with a handle 14 for a manual operation. Instead of this handle a pulley for motor drive may be attached.k

The rotation ofthe crank 11 will cause the cable to move back and forth, and with it Will reciprocate the saw blade 6. The cable may be tightened by means of a screw 15 engaging blocks 16 for the ends of a shaft 17 of the roller 9, these blocks being placed in slots 18. A

The tightness of the cable varies with each revolution of the crank, and in order to maintain it under a tension, 1 attach a shaft 19 with rollers 2O to the cable. and provide cam surfaces on the frame for these rollers. These cam surfaces comprise a de pression 22 occupied by the rollers 19. when the crank 11 is at right angle with a line C-G which is tangent to the wheels 9, and elevated portions 21 occupied by the rollers when crank 11 is in one of the dead centers. Lines L-L indicate 'the extreme positions of the rollers. 21-22 is so shaped, that the cable tension remains practically constant for all positions of the crank 11. rlhese surfaces are so spaced, that with the crank 11 in one dead centerA the rollers .engage the high point 22, thereby keeping the cableztight, and with the crank at right angles with the cable the rollers slide into depressions 21.

The fraine 1 is provided with apertures 23 for a shaft 24 with a ratchet Wheel 25. The shaft is attached to a sliding box 26- with rollers 27. The end of the shaft 24 has a slot 28 for a spring catch or pawl 29 on the frame 1.

The slidingl box 26 is mounted on a stand 30 and may bemoved up or down by means of a cable or chain 31, stretched around rollers`32 on the stand. A handle 82 may be used for operating the cable. The cable endsare attached to the box 26.

The frame may be quickly removed from the stand depressing lt-he catch 29 and sliding it off the shaft 24.

Then in operation the saw may be placed in any angular position by locking the frame 1 on the ratchet wheel 25 byineans of a pawl 33. y

With the arrangement shown the weight of the frame 1 will keep the saw pressed against the work, such as a log 34. A spring 35 may be also used, thefposition and tension of the spring being adjusted by placing the pin 36 in different holes 37 in the stand 30. This spring is especially useful, when the saw is used for sawing off trees with the stand 30 in a horizontal position.

rlthe stand 30 has an extension vlug 38 with tongues 39 and 40, forming a clamp for the Work, such as a log 34. The other ends of the tongues are drawn together by means of a chain 42, attached with one `end to the tongue 40 and wound around a sprocket 41- on the tongue 39. rllhe sprocket has a handle 43. A pawl-44 locks the sprocket, when the chain is tightened.

Important advantages of my sawing apparatus are, that it can be operated by one person, can be easily moved from one place to the other, canbe attached to the Work, and can be adjusted for various degrees of The curve or cani surface f pressure required between the saw and the work.

I claim as my invention:

1. In a sawing apparatus, the combination with an open frame, a saw blade placed between the ends of said frame, holders for the ends of said blade slidablyv mounted in the ends of said frame, a flexible carrier attachedto the ends of said frame, a plurality of rollers supporting said flexible carrier, a crank shaft adapted to impart a reciprocating movement to said flexible carrier, and rollers attached to said cxible `carrier and adapted'to slide over said frame, f the frame under said rollers being cam shaped so as to keep said flexible carrier under tension for all positions ofsaid crank shaft.

between the ends ofisaid ,frame7 holders for the ends"`-of said saw blade slidably mounted in said frame, a flexible carrier attached to said holders, a plurality of rollers around said frame adapted to support said flexible carrier, a crank rotatively mounted in said iframe, said flexible carrier being attached to said crank so as to receive a reciprocating movement when said crank is rotated, and a pair of rollers attached to said flexible carrier and adapted to slide over the edges of said frame, said edges being cani shaped and comprising elevations for said pair of rollers, whensaid crank is in one of the dead centers, and a' depression when said crank is at right angle to a line tangent to said rollers supporting said flexible carrier.

Signed at New York in the county of New York and State or New York this 1Q day of August A. D. 1922.

JACOB T. Vunis-ia. 

